This is standard procedure in the treatment of a herniated disk. The Cowboys hope to know if the injection had a positive effect by Wednesday or Thursday, per Rapoport.

Rapoport reported Monday that it's believed Romo's injury eventually will require surgery, but it's too early to definitively know his status. Romo appeared to suffer the injury in the second half of Sunday's NFC East battle with the Washington Redskins. He played through pain in leading Dallas on two fourth-quarter scoring drives in a 24-23 win.

UPDATE: Rapoport reports that the Cowboys worked out four quarterbacks: Caleb Hanie, David Carr, John Skelton and Tyler Thigpen, with the team set to sign 41-year-old Jon Kitna as insurance, per a person informed of the deal.